Spark-plug.



A. L. HIGGS.

` A SPARK PLUG'.' APPucATloN FILED ocT.5. l9xs.`

Patented Nov. 20, 1917.

'Ebensbur ,jn'thecounty of Cumbria und tlf-State of]y ennsylvana, huye invented 'new there'fmlorder to-obtains View o'f the ex;4 *posed portionY ofV the. electrode, the v iewbe-4 fangl.obtaiuqgliluongh the extreme outer end4 the a'me `lineas Fg. 2, 'shownga moclled (Ii form of' binding post. i

Eig. 6 i's a fragmentarysectlon token on thesameline us 'the upper part ot'Fig.. 1 showing modiied wey `ofa's sembl1ng the Sli Plalh'eferring tonthedraxvings designates Ygenemlly v s arl: plug comprlsmg the me.

tullio outer. s e1l 1,,thepower'electrode "them oorggi wljichieusuallyjof porcelain or non' MLid'e-andiformed with n .central opening [fthe-United- States, residing ut lug in whichf .held between two pncliiigjfllfin S und electrodes 3 and the insulnting V momenti@ of Lene'rirmne Pim-,ent'edNov.2i),A 19131.` App'uu'upniued october mais.' 'serigixmzamm throigh which the powergelectrode 2 s'l serte. Ix 1 fthe,preferretl embodiment o f thi in yention, the-outer end ofthe 'core iigforih'ed 1n 1 t's outer' face"\\"ith u1 1";{11nulz\rrecesso.soy A 'metal leeve 6 is inserted over-'the end'of andthe inerend of sid'leeife- 1s spun or otherwise in\\"urdly"detlebted `to form u flange 7' which ist.presed'ito-tlie fixed relation'toihe core 4; 8 designates .n metal .feed 1-ing recess 5 and ser-yes toancfo'r thesleeve 6 in' 86 'insertodinto the sleeve zigaunsi:4 the, outer extremity of the core 1 nsfshonn ii;l'l5`1 g1f i 1 and Thiel-ing S which sillustrnted in '7'0 detail "1n Fig. el is of thefsplit vnretyftlie' same being divided o r split nl ong the 16h# 'lique line 9 so ns to form oyerln pingend portions haring beveledA meeting noce, In-

jtermilly the ring S is reve1's'e1y bev' eled to 75 inline with the egitremity ofthe Vc'orrespondingr-ndA of 'the po Wer-electrode f2' de s'hon'nQ theenmefgures, the eletrode 2 'e ending at lts outer end-beyond thefooreh 'Agnislt `80 Enoircling the shell 6 is metiillj'nnd "15 which as shown in rEig-f24 s'plitY end pnnded to form 4the coin'plen'ient'l se' i cylindrical portions 16.f 'bilicl the lutter being externallj" tlieL d re ccivea clamping nut -17 b if means .of which' 1005 the two parts of the binding post are vlompcl together. and the "band lolmnpod firmlyto clamp the .current lwire,' (not shown) ma" against the clamping nut lfto insure. good;

electricl Contact.

Under the arrangement hereinabove -def scribed and shown, thecurrent received. at

the binding post passes tllroughthe bond 115 l l0" to the sha1 e, mi feed ring s which neem contact with the shell `by reason of 'its inherent expansive properties, and then jumps to the O Wer electrode 2. It is'onlynecessary tog ance' through thev transparent panel 12 -Whlch is.'preferably glassin order .to observe j 'whether or not the current'is reaching the 4electrode 2, as the' spark will beclearly visible by reason o'f itl having toy bridge the space between the feed ring and theelectrode.

Instead'of using theband '15 as herein- 'above described,.the binding post shown at 19 in Fig. 5 may be inserted through va hole in the sleeve 6 and'provided -at its linner end witha head 20 which lies between the sleeve 6 and' core 4. T he post 19 will be provided with a clamping nut 21` and a Wire ret'ainin nut 22 correspondin With the nuts 17 an 18 of the preceding gures.'

In F ig. 6 I'have illustrated another Wayl of combining the parts to produce the same result. In this instance the core 4 is formed with diametrically opposite bayonet slots 23 While the sleeve indicated at, 24 'and corre'- sponding with the sleeve 6 of the preced ingfigures is provided with internal pro- 'ections or studs 25 Which are received 'in the ayonet slots 22 and which serve to lock the iso.

-ne'ction with Fig. 1. ringlof Fig. 1;*another gasket 26 of any suitable soft material is placed against the 'and- 26 prevent Sleeve 24 tothe core 4' by a partial longitudinal and a partial turning movement of the sleeve 24 inrelation to thecor'e 4. vThe eed .r1ng 87 the gasket .1 1 and the glass or transparent panel 12'are placed vvlthin the shell 24 in the same manner as described in con- Instead of-thepacking outer surface of the panel 12 and forms a seat for a tubular plug-27 which is externally threaded and screwed into the internally threaded outer extremity of the shell 24 las shown in Fig. 65 the plug 27 'serving to hold the p ane'l'12. in fpla-ce .While the gaskets 11 racture of the glasses the plug 'becomes highly heated.

do' not desire to be restricted to the exact Vdetails I of construction `and arrangement .herein'aboiredescribed as it will be apparent that changes may be made inthe form, pro' portion and minor -deta-ils of'construction which maybe resorted to Without departing from the principle or'sac'ricing any of the advantages'of the invention.

-a source of electricalenergy.

2. t The .'ombination with a spark plug, of a metal sleeve encircling the o'uterpen'd4 portion of the core and stened thereto, an

electrodeextending through said'core' and projecting 'at its outer end beyondthe corresponding end of the core, a split .expan' sion Afeed ring for the current encircling the outerextrernity of said electrodein electrical' contact with said sleeve andhaving a continuous annular inneredge concentric. -With said electrode, and 'means foijconnecting said sleeve with a source-of electrical energy..

3. rIhe combination with a spark plug', of a Ametal sleeve encircling the outer end portion of the core and fastened thereto, an

electrode extending through l.Said coreand projecting at its outer endV beyondthe lcor- .responding end of the core2 a feed ring for the'clirrent encircling saidvelectrodein electrical contact with said sleeve,and''1heans for connecting said sleeve with afsource of electrical energy, said feed .'r'ing having a reversely beveled inner face 'lyi jacentextremity ofthe electrode` I y l 4. The combination with asparktplug-,of

a metal sleeve encirclin the outerzjendfpprs.A tlon of the4 core' and'. astened thereto', .an-

electrode extendingthrough said corezand proJectingat its-outer end beyond the' .cor-

' responding endfof` the core, a feed ring forapproX-imately in transverse alinement withl the adthe current encircling. the outer extremity of said electrode in electrical contact .With 'said sleeve and having aA continuous 'annular' inner. edgeconcentric With. said.l electrode,

means forconnecting said *sleevejwith Aa4 sourcef'of electrical energy, a split clamping.'

band surrounding said sleeve,' andv a-b'nding post on said band. v

VIn testimony Whereofl afiix. my signature.

' ALFRED L. RIGG-S. I 

